BEC-22225 MCQ questions with answers

 

Active components

a)      Introduces gain in circuit

b)      Requires external power supply

c)       Processes on given signal

d)      All of above

 

Examples of passive component

a)      Resistor, capacitor, inductor

b)      Diode, SCR, Transistor

 

Unit of resistor, capacitor and inductor

a)      Farad, Henry, Ohm

b)      Henry, Ohm, Farad

c)       Ohm, Henry, Farad

d)      Ohm, Farad, Henry

 

Correct sequence of colors for resistor color coding is

a)      BBROYBGVGWGS

b)      BBROYGBVGWGS

c)       BBROYGBVGWSG

d)      BBORYGBVGSGW

 

What will be the value of resistor having color codes Yellow, Violet, Yellow, silver

a)      0.47 µF ±5%

b)     0.47µF ±10%

c)      4.7 µF ±5%

d)      47µF ±10%

 

 Value of resistor in ideal voltage and current source is?

a)      0 and infinite

b)      infinite and 0

Multiplier of blue color in resistor color coding is __________

a)      0

b)      10^1

c)       10^5

d)      10^6

 

In resistor color coding, tolerance of silver is________

a)      ±5%

b)      ±10%

c)       ±20%

d)      ±15

 

Voltage source can be converted in current source.

a)      True

b)      False

 

Maximum value or height of signal waveform is called as ___________ and measured in _______

a)      Frequency and Hz

b)      wavelength and Volts or amp

c)       amplitude and meter

d)      amplitude and volts or amp

 

_________ is the distance between two similar points on two back to back waves.

a)      Amplitude

b)      Wavelength

c)       Frequency

d)      Phase

 

 Material used for fabrication of IC’s are generally_________

a)      Silicon

b)      silver

c)       Copper

d)      Germanium

 

_________ are difficult to be fabricated on an IC

a)      FET

b)      Inductors

c)       Resistors

d)      Diodes

 

ICs are used in________

a)      Linear devices only

b)      Digital devices only

c)       Both A & B

d)      None of the above

 

Digital ICs can process_______

a)      only linear signals

b)      only Digital signals

c)       Both A & B

d)      None of the above

 

Rectifier is used to convert ______ to ________

a)      DC quantity to AC quantity

b)      Voltage to current

c)       Current to voltage

d)      AC quantity to DC quantity

 

Ripple factor is ____________ components in the output of rectifier

a)      Very useful

b)      Unwanted

c)       Essential

d)      None of above

 

Filters are used to remove ___________ from rectifier output

a)      DC components

b)      AC components

c)       Both A & B

d)      None of above

 

Capacitor filter is used to pass___________ and block__________.

a)      AC and DC

b)      DC and AC

c)       Voltage and current

d)      Current and voltage

 

The output of rectifier is

a)      Pure AC

b)      Pure DC

c)       Impure DC

d)      None of above

 

In full wave bridge rectifier, ________ diodes are used

a)      One

b)      Two

c)       Four

d)      six

 

Efficiency of half wave rectifier is __________ %

a)      45 %

b)      50 %

c)       40.6 %

d)      41.2 %

 

Inductor filter is connected in ____________ when used as filter in rectifier circuit.

a)      Series

b)      Parallel

c)       Reverse

d)      None of above

 

Peak inverse voltage (PIV) of full wave bridge rectifier is _______.

a)      2Vm

b)      Vm

c)       0.5Vm

d)      1.11

 

Rectifier circuits are used in

a)      Voltage regulators

b)      Power supplies

c)       Both A & B

d)      None of above

 

Major disadvantage of center tapped full wave rectifier is

a)      It is more noisy

b)      Exact Center tapping of transformer

c)       Less efficiency

d)      Less output frequency

 

The types of filter used in rectifier circuits are

a)      C filter

b)      L filter

c)       CLC filter

d)      All of above

 

Diode clipper is the circuit used to_________

a)      Shift the position of input waveform

b)      Remove the portion of input waveform

c)       Shift the position of output waveform

d)      Remove the portion of output waveform

 

Diode clamper circuit is used to__________

a)      Shift the position of input waveform

b)      Remove the portion of input waveform

c)       Shift the position of output waveform

d)      Remove the portion of output waveform

 

To emit blue light out of LED (light emitting diode) _____________ semiconductor material is used.

a)      Gallium arsenide (GaAs)

b)      Gallium arsenide phospide (GaAsP)

c)       Gallium nitrite Ga(NO2)3

d)      Gallium phospide (GaP)

 

Zener diode in forward bias is used as_______________________

a)       Voltage regulator

b)       As ordinary PN junction diode

c)       Amplifier

d)       None of above

 

PN junction diode has sharp reverse breakdown.

a)      True

b)     False

 

To reverse bias the PN junction diode, positive terminal of power supply is connected to ________ of diode.

a)      Anode

b)      Cathode

c)       Junction

d)      None of above

 

In forward bias, PN junction diode can be used as___________

a)      Rectifier

b)      Closed switch

c)       Both of above

d)      None of above

 

In PN junction diode, doping level is high as compared to zener diode.

a)      True

b)      False

 

Zener diode can be used in application_____________

a)      Voltage stabilizer

b)      Motor protection

c)       Wave shaping

d)      All of above

 

A pn junction diode, which emits light when forward biased, is called as __________

a)      Tunnel diode

b)      Crystal diode

c)      Schottky diode

d)     Light emitting diode

 

The point at which diode forward voltage starts to increase sharply is called as____________

a)      Depletion layer

b)      Barrier potential

c)       Knee voltage

d)      None of above

 

Voltage regulators are used to _________

a)      Maintain constant input voltage

b)      Maintain constant output voltage

c)       Increase input voltage

d)      Increase output voltage

 

Voltage requires______________ for proper operation

a)      Line regulation only

b)      Constant load only

c)       Load and line regulation

d)      Load regulation only

 

Output of voltage regulator varies with the variation in input voltage.

a)      True

b)      False

 

A power supply having voltage regulation of __________ is unregulated power supply

a)      2 %

b)      5 %

c)       6 %

d)      10%

 

The term transistor refers to__________.

 

a)      Transfer Resistor

b)      Transformer

c)       Transfer Amplifier

d)      None of above

 

Transistor is _________

a)      Unipolar component

b)      Bipolar component

c)       Passive component

d)      None of above

 

Types of transistors are

a)      PNP & NNP

b)      N-channel

c)       NPN & PNP

d)      P-channel

 

In the symbol of transistor arrow is placed on _______ terminal.

a)      Drain

b)      Source

c)       Base

d)      Emitter

 

In the symbol of transistor arrow head indicates

a)      P to N direction

b)      Direction of ground terminal

c)       Base terminal

d)      Direction of voltage

 

In which region transistor acts as open switch?

a)      Active region

b)      Ohmic region

c)       Saturation region

d)      None of above

 

In bipolar devices, current conduction is due to

a)      One type of polarity

b)      Majority charge carriers

c)       Minority charge carriers

d)      Both polarities

 

Transistor is __________ controlled device

a)      Voltage

b)      Current

c)       Amplitude

d)      all of above

 

Which not type of transistor configurations?

a)      Common Emitter

b)      Common Base

c)       Common source

d)      Common collector

 

Transistor works as amplifier in

a)      active region

b)      cut off region

c)       saturation region

d)      all of above

 

Location of Q point for amplifier application is

a)      in the cut off region (on x-axis)

b)      in saturation region (on y-axis)

c)       in active region (center of DC load line)

d)      all of above

 

In transistor, DC load line refers to

a)      No signal value of IC and VCE

b)      Line drawn on transistor characteristic under zero signal condition

c)       Both of above

d)      None of above

 

Alpha is the current gain of transistor in ____________ configuration.

a)      common collector

b)      common base

c)       common emitter

d)      none of above

 

Alpha (current gain of transistor) is defined as

a)      ratio of collector current to emitter current

b)      ratio of collector current to base current

c)       ratio of change in collector current to change in emitter current

d)      ratio of emitter current to base current

 

Beta is the current gain in _______________ configuration.

a)      common emitter

b)      common collector

c)       common base

d)      none of above

 

Transistor amplifier is used to________

a)      increase the strength of weak AC signals

b)      convert AC to DC

c)       generate signals of particular frequency

d)      increase the strength of weak DC signals

 

Thermal runway is

a)      related to rectifier circuit regarding ripple factor

b)      related to transistor which is self destruction of stabilized transistor

 

Need of transistor biasing is__________

a)      for faithful operation of transistor

b)      use transistor for different application

c)       Both of above

d)      None of above

 

In RC coupled amplifier, R1 & R2 resistors are used for_______

a)      voltage divider biasing

b)      stabilizing the transistor

c)       oppose the flow of AC current

d)      Pass AC and block DC

 

In RC coupled amplifier_________________ is used for stabilization

a)      Collector resistor (Rc)

b)      Coupling capacitor (Cc)

c)       Emitter resistor (Re)

d)      Input capacitor (Ci)

 

Source and drain terminals of JFET are interchangeable

a)      True

b)      False

 

Which material is used to isolate/separate gate from bar in MOSFET?

a)      FeCl3

b)      SiO2

c)       GaAsP

d)      GaP

 

Regions of output characteristic of JFET are

a)      active, cut off and saturation

b)      active, cut off and Q-point

c)       cut off, active and ohmic

d)      Not listed above

 

The full form of MOSFET is

a)      metal operated semiconductor filed effect transistor

b)      metal oxide super filed effect transistor

c)       metal oxide semiconductor filed effect transistor

d)      mix oxide semiconductor field effect transistor

 

Due to capacitor effect, opposite charges of gate voltage get accumulated in bar in MOSFET

a)      False

b)      True

 

In FET, the voltage at which depletion layer touches each other and completely block drain current is called as_______________

a)      Peak inverse voltage

b)      Pinch off voltage

c)       Breakdown voltage

d)      Drain to source voltage

 

To control drain current flowing through channel of FET, gate to source voltage (Vds) is must be connected in___________

a)      reverse

b)      forward

c)       None of above

d)      All of above

 

____________is the ratio of change of drain to source voltage to the change of drain current at a constant gate to source voltage.

a)      DC drain resistance

b)      AC drain resistance

c)       Transconductance

d)      Amplification factor

 

In FET, the term field means?

a)      Area

b)      Current

c)       Voltage

d)      None of above

 

Output characteristic of JFET is the curve plotted between________________

a)      Drain current vs Drain to source voltage

b)      Drain current vs Gate to source voltage

c)       Collector current vs Collector to emitter voltage

d)      Base current vs Drain to source voltage

 

The advantages of JFET over BJT is

a)      High switching speed

b)      Small in size

c)       Low noise

d)      All of above

 

Which one is not application of JFET

a)      Amplifier

b)      Variable resistor

c)       Switch

d)      Rectifier

 

____________is the ratio of drain to source voltage to the drain current at a constant gate to source voltage.

a)      DC drain resistance

b)      AC drain resistance

c)       Transconductance

d)      Amplification factor

 

Types of JFET are

a)      PNP & NPN

b)      Depletion and Enhancement

c)       P-channel and N-channel

d)      All of above

 

FET is _______________ controlled device

a)      voltage

b)      current

c)       heat

d)      capacitor

 

_____________is the ratio of change in drain current to change in the gate to source voltage at a constant drain to source voltage.

a)      Amplification factor

b)      Shorted drain to source current (IDSS)

c)       Tansconductance

d)      Pinch off voltage

 

What is full form of JFET?

a)      Joint Field element transistor

b)      Junction Filament effect transistor

c)       Junction Field element transistor

d)      Junction Field Effect Transistor

 

Which is not the type of MOSFET

a)      Enhancement

b)      Depletion

c)       Regulated

d)      Linear

 

If reverse bias on the gate terminal of a JFET is increased then width of the conducting channel________

a)      remains constant

b)      increases

c)       decreases

d)      All of above

 

Which is not the terminal of JFET

a)      Gate

b)      Base

c)       Drain

d)      Source

 

In cut off region, the value of gate to source voltage and Drain current is

a)      Maximum and minimum

b)      Maximum and maximum

c)       Minimum and maximum

d)      None of above

 

JFET is_____________device

a)      Bipolar

b)      Unipolar

c)       Unijuncion

d)      None of above

 

Gate of MOSFET is isolated from channel.

a)      True

b)      False

 

The term transconductance in JFET depends on

a)      Drain current

b)      Gate to source voltage

c)       Source current

d)      Drain to source voltage

 

___________ are the types of transducers that work on energy conversion principle and does not require external energy sources for their operation

a)      Thermocouple transducers

b)      Active transducers

c)       Passive transducers

d)      None of above

 

The main function of sensor is to _________ the environment around it

a)     Convert

b)    Sense

c)      Heat

d)     Cool

 

LVDT is __________ type of transducer

a)      Passive

b)      Analog

c)       Both A & B

d)      Digital

 

__________type of transducers works on energy controlling principle and does requires external energy sources for their operation.

a)      Thermocouple transducers

b)      Active transducers

c)       Passive transducers

d)      None of above

 

When two dissimilar metals are connected in closed loop and if current forced to flow through the closed loop then one junction will be heated and other will become cool. This effect is called as____________

a)      Seebeck effect

b)      Heating effect

c)      Cooling effect

d)     Peltier effect

 

When mechanical force is applied to ____________ material, it will converted into electrical energy and vice versa.

a)      Crystalline material

b)      Semiconductor

c)       Insulator

d)      Conductor

 

____________ sensor is used to detect the presence of an object through change in the current in

its coil and to measure the small changes in displacement/ movement through changes in current.

 

a)      Thermocouple sensor

b)      Photo detector sensor

c)       Resistive sensor

d)      Proximity sensor

 

______ converts the light energy into current or voltage in reverse bias condition.

 

a)      Thermocouple sensor

b)      Photo detector sensor

c)       Resistive sensor

d)      Proximity sensor

 

 

Which of the following is not a characteristic of ideal transducer?

a)      High dynamic range

b)      Low linearity

c)       High repeatability

d)      Low noise

 

The difference between the measured value and the true value is called

a)      Relative error

b)      Absolute error

c)       Probable error

d)      Gross error

 

__________ error is the ratio of absolute error to the true value of quantity to be measured

a)      Relative error

b)      Absolute error

c)       Probable error

d)      Gross error

 

Accuracy of transducer is determined by _____

a)      Half scale deflection

b)      Full scale deflection

c)       ¼ of full scale deflection

d)      All of above

 

Capacitive transducers are used for__________ measurement

a)      Static

b)      Transient

c)       Dynamic

d)      Both static and dynamic

 

What is the relation between scale factor and sensitivity of a transducer?

a)      Scale factor is double of sensitivity

b)      Scale factor is inverse of sensitivity

c)       Sensitivity is inverse of scale factor

d)      Sensitivity is equal to scale factor

 

Resistive transducers are ______________

a)      Primary transducers

b)      Secondary transducers

c)       Either primary or secondary

d)      Both primary or secondary

 

Which of the following represents application of inductive transducers?

a)      Displacement measurement

b)      Thickness measurement

c)       Both displacement and thickness measurement

d)      None of above

 

Change in output of sensor with change in input is ____________

a)      Threshold

b)      Slew rate

c)       Sensitivity

d)      None of the mentioned